League officials have reached out to Harper to discuss his participation in the event, according to a report from FanRag Sports. MLB has not pressured Harper to commit to the derby - which will take place in his home ballpark - the report says.

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MLB is worried stars like Harper, J.D. Martinez, Mookie Betts, Aaron Judge and Giancarlo Stanton may not participate in this year's home run derby, according to the report.

Harper has only entered the derby once, at Citi Field in 2013. He was defeated by Yoenis Cespedes in the finals that year.

The 2018 home run derby and All-Star Game will be held July 16-17 at Nationals Park in Washington, D.C. Harper, a five-time All-Star, has hit .224 with 43 RBIs and an NL-leading 19 home runs this season.